<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="num-list">
        <div class="num-list-item">1</div>
        <div class="num-list-item">2</div>
        <div class="num-list-item">3</div>
        <div class="num-list-item">4</div>
        <div class="num-list-item">5</div>
        <div class="num-list-item">6</div>
        <div class="num-list-item">7</div>
        <div class="num-list-item">8</div>
        <div class="num-list-item">9</div>
        <div class="num-list-item">10</div>
        <div class="num-list-item">11</div>
        <div class="num-list-item">12</div>
        <div class="num-list-item">13</div>
        <div class="num-list-item">14</div>
        <div class="num-list-item">15</div>
        <div class="num-list-item">16</div>
        <div class="num-list-item">17</div>
        <div class="num-list-item">18</div>
        <div class="num-list-item">19</div>
        <div class="num-list-item">20</div>
        <div class="num-list-item">21</div>
        <div class="num-list-item">22</div>
        <div class="num-list-item">23</div>
        <div class="num-list-item">24</div>
        <div class="num-list-item">25</div>
        <div class="num-list-item">26</div>
        <div class="num-list-item">27</div>
        <div class="num-list-item">28</div>
        <div class="num-list-item">29</div>
        <div class="num-list-item">30</div>
    </div>
    <img src="demo.jpg" alt="" srcset="">
    <script src="index.js"></script>
</body>
</html>